// pulse the servo every 20 ms (refreshTime) with current pulseWidth // this will hold the servo's position if unchanged, or move it if changed if (millis() - lastPulse >= refreshTime) { digitalWrite(servoPin, HIGH); // start the pulse delayMicroseconds(pulseWidth); // pulse width digitalWrite(servoPin, LOW); // stop the pulse lastPulse = millis(); // save the time of the last pulse } }